Media buying is the easiest ecommerce role to fake in an interview and the most expensive one to get wrong. Everyone has a screenshot. Everyone has a ROAS story. The difference between a buyer who compounds your account and one who quietly burns it shows up in how they diagnose, how they test, how they brief creative, and how honestly they report. This guide gives you the questions, the test, and the red flags.
Key takeaways
- Hire for process, not screenshots. Past ROAS belongs to a product, a margin, and a creative team you cannot see.
- The eight interview questions below reveal whether a buyer diagnoses before acting, tests with rules, and reports honestly.
- Always run an audit test on a real or sanitized account before hiring. It takes an hour and tells you more than three interviews.
- A media buyer without creative supply plateaus. Plan the creative pipeline (a creative strategist, designer, or editor) at the same time.
- Give them margin targets, product priorities, decision speed, and a weekly slot. Those four things decide more than the buyer's skill does.
What an ecommerce media buyer actually owns
A media buyer plans, launches, and manages paid campaigns, typically across Meta, Google, and TikTok. In ecommerce that means account structure, budgets and pacing, audiences and exclusions, the testing calendar, creative briefs to whoever makes the ads, landing page feedback, and a weekly report that ties spend to blended results rather than to a single platform's claim. The buyer does not usually make the creative; the buyer decides what to test and reads the results.
This matters for hiring because the role sits between three other roles: the creative strategist who turns insights into briefs, the designer or video editor who produces the assets, and whoever owns the store's conversion rate. A buyer hired alone, with no creative supply, will do everything right and still plateau.
Before you interview anyone
- Know your numbers. Contribution margin by product, blended cost of acquisition you can afford, and how you measure new customers vs returning. If you cannot state these, no buyer can hit them.
- Decide the scope. One platform or three? Prospecting and retention? Who owns landing pages? Write it down.
- Audit your own account first. Even a rough look at structure, creative age, and tracking health tells you what to ask about.
- Secure creative supply. If nobody is producing new ads weekly, hire for that in the same plan.
The interview scorecard
Eight questions. Flip each card to see what a strong answer sounds like and what a red flag sounds like. Copy the questions and take them into the interview.
Flip a card to see the strong answer and the red flag. The tally tracks what you have covered.
Want a buyer who already passed this scorecard?
Get my custom hiring planThe audit test
Interviews reward people who interview well. The audit test rewards people who buy media well. Give the candidate read-only access to your ad account, or a sanitized export if you prefer, and ask for a one-page written audit within a few days:
- What would you change first, and why?
- What would you deliberately leave alone for now?
- What would you test in week one, and how would you know if it worked?
- What can you not tell from the account alone, and what would you ask me?
Read it for diagnosis before action, for respect for what is already working, and for honesty about uncertainty. A candidate who proposes a full rebuild without asking about your margins has told you everything you need to know. This is a compressed version of the skill challenge inside the Hero Selection System; if you hire through Ecom Heroes, it has already happened.
Red flags, in order of cost
- Results without context. A ROAS figure with no product, margin, spend level, or creative team attached is a story, not a track record.
- No testing rules. Buyers who cannot say when a test is over will keep spending on hope.
- Platform-only reporting. If every report is a screenshot from inside the ad platform, your real profitability will be a surprise.
- Creative indifference. "Send me more ads" is not a creative strategy. The account will fatigue and the buyer will blame the algorithm.
- Silence under pressure. Costs double and you hear nothing for two days. The skill was never the problem; the communication was.
Set them up to win
The brands that get the most from a media buyer treat them as an operator, not a vendor. Share the numbers that matter (margin, acquisition targets, product priorities, inventory constraints). Guarantee creative supply, whether that is a creative strategist and editor or an existing team. Decide budgets fast; a buyer waiting three days for a yes is a buyer losing the week. And keep a fixed weekly slot: thirty minutes, the written report read in advance, decisions made in the room.
If you are hiring a media buyer alone, ask yourself who is making the ads. If the answer is "the buyer, somehow", you are hiring two roles and paying for one. A custom hiring plan will say so before anyone starts.
Frequently Asked Questions
What does an ecommerce media buyer do?
A media buyer plans, launches, and manages paid campaigns on platforms such as Meta, Google, and TikTok: account structure, budgets, audiences, testing, creative briefs, and reporting. In ecommerce the job is measured against blended profitability, not just the platform's own numbers.
Should I hire a media buyer or an agency?
An agency gives you a team and takes the account off your desk, usually on its own priorities and reporting cadence. A dedicated media buyer gives you one accountable person who learns your products, margins, and creative. For most brands past the early stage, a dedicated buyer paired with a creative strategist produces more compounding than a shared agency pod.
How do I test a media buyer before hiring?
Give them read access to an account, or a sanitized export, and ask for a written audit: what they would change first, what they would leave alone, and what they would test in week one. Look for diagnosis before action and honesty about what they cannot know yet.
What does a media buyer need from me?
Margin targets, product priorities, access to creative production, fast decisions on budget, and a fixed weekly slot. A buyer without creative supply or decision speed will plateau no matter how skilled.
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